They come out pretty hard, but they do slide out. Harder to get the one out over the screw head. Push it out so only the short side needs to clear the screw head. Try to find a hard, square surface like a table edge that you can just get the metal metal edge on and push down on the gripper with the metal edge held in place by whatever you're pushing on. Or, do it just the opposite, with the rubber gripper on the squared off hard surface. May need a small block of wood to push down on the metal channel. Good luck.